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        <h5 id="npm镜像推荐和使用"><a href="#npm镜像推荐和使用" class="headerlink" title="npm镜像推荐和使用"></a>npm镜像推荐和使用</h5><p>镜像推荐<br>淘宝镜像： </p>
<ul>
<li>搜索地址 <a target="_blank" rel="noopener" href="http://npm.taobao.org/">http://npm.taobao.org/</a></li>
<li>registry地址 <a target="_blank" rel="noopener" href="http://registry.npm.taobao.org/">http://registry.npm.taobao.org/</a></li>
</ul>
<p>使用:</p>
<ul>
<li>临时使用 <code>npm --registry https://registry.npm.taobao.org install express</code></li>
<li>永久使用<figure class="highlight shell"><figcaption><span>script</span></figcaption><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">npm config set registry https://registry.npm.taobao.org</span><br><span class="line"></span><br><span class="line">// 配置后可通过下面方式来验证是否成功</span><br><span class="line">npm config get registry</span><br><span class="line">// 或</span><br><span class="line">npm info express</span><br></pre></td></tr></table></figure></li>
<li>使用<code>cnpm</code>命令<figure class="highlight shell"><figcaption><span>script</span></figcaption><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">npm install -g cnpm --registry=https://registry.npm.taobao.org</span><br><span class="line">// 使用</span><br><span class="line">cnpm install expresstall express</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h5 id="vue的计算属性和观察属性"><a href="#vue的计算属性和观察属性" class="headerlink" title="vue的计算属性和观察属性"></a>vue的计算属性和观察属性</h5><p>计算属性是自动监听依赖值的变化，从而动态返回内容；<br>监听是一个过程，在监听的值变化时，可以触发一个回调，并做一些事情。</p>
<p>计算属性由两部分组成：get和set，分别用来获取计算属性和设置计算属性。<br>默认只有get，如果需要set，要自己添加。<br>set设置属性，并不是直接修改计算属性，而是修改它的依赖。</p>
<p>计算属性和普通属性的区别？<br>可以像绑定普通属性一样在模板中绑定计算属性，<br>在定义上存在区别： 计算属性的属性值必须是一个函数。</p>
<p>计算属性VS方法<br>computed是可以缓存的，methods不可以缓存<br><strong>只要相关的依赖没有改变，多次访问计算属性得到的值就是之前缓存的计算结果，不会多次执行</strong></p>
<p>侦听属性（观察属性）<code>watch</code><br>watch中可以执行任何逻辑，如函数节流、Ajax异步获取数据、甚至操作DOM(<strong>不建议</strong>)</p>
<h5 id="lombok"><a href="#lombok" class="headerlink" title="lombok"></a>lombok</h5><ul>
<li>注解<code>@Cleanup</code><br>使用在局部变量上面。<br>在需要关闭流对象时，帮助你自动关闭。</li>
</ul>
<h5 id="java-try-with-resources-语法糖"><a href="#java-try-with-resources-语法糖" class="headerlink" title="java try-with-resources 语法糖"></a>java try-with-resources 语法糖</h5><figure class="highlight text"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">try(声明并初始化需要关闭资源的变量，多个的话使用分号`;`分隔) &#123;</span><br><span class="line">&#125;catch(e) &#123;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>java 获取项目中文件的输入流<br>获取到<code>this.getClass().getClassLoader().getResourceStream(&quot;文件的类路径&quot;);</code><br>or<br>使用springboot下的<code>ResourceUtils.getFile(&quot;classpath:类路径&quot;)</code></p>
<p>java 文件下载到浏览器端<br>前端调用： <code>window.open(url)</code>, 使用ajax的话，下载不了。<br>后端下载： HttpServletResponse的输出流</p>
<h5 id="springboot-多数据源实现"><a href="#springboot-多数据源实现" class="headerlink" title="springboot 多数据源实现"></a>springboot 多数据源实现</h5><p>在application.yml中添加其他数据源的配置信息，<br>在config中初始化每个数据源，</p>
<h5 id="oracle-用户对表空间’XXXX’无权限"><a href="#oracle-用户对表空间’XXXX’无权限" class="headerlink" title="oracle,用户对表空间’XXXX’无权限"></a>oracle,用户对表空间’XXXX’无权限</h5><p>为用户授予resource权限，则不对用户的表空间进行限制<br><code>grant resource to username</code><br>授予用户表空间不受限制的权限<br><code>grant unlimited tablespace to username</code></p>
<h5 id="FAQ"><a href="#FAQ" class="headerlink" title="FAQ"></a>FAQ</h5><ol>
<li>Q1: 在springboot中，注解@RequestMapping的<strong>produces</strong>属性的含义?<br> 作用： 指定返回值的类型，不仅如此，也可以设定返回值的字符编码。<br> 与之相对应的一个属性为_consume_, 指定处理请求的提交内容的类型，如application/json,text/html.</li>
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